Videos: AC72

The AC72s are among the most leading-edge sailboats every built. With a winged mast and hydrofoils that lift the boat entirely out of the water, they are like nothing that has sailed before (and utterly useless for anything but big-budget racing).

The first of the big cats goes sailing on San Francisco Bay. This is the boat with which Oracle Team USA hopes to win the America's Cup in 2013. The sail was cut short by a gear failure, not too surprising for the debut of a huge new boat built at the bleeding edge of sailing technology.